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as minimize noise impacts. Dust should be minimized because the majority of mining will take <br /> place below the water table; therefore,the material to be mined will be wet. Almost all gravel <br /> sent to the processing plant will be wet. Water application within processing equipment will keep <br /> the material wet. <br /> The Alma Placer mining structure will resemble a coal strip operation as dozers, loaders and <br /> trucks will be used to move overburden from areas to be mined to previously mined areas. Two <br /> active mining areas will be open on-site simultaneously to support the two sluices. Excess <br /> overburden may be used to fan out to the east and ensure that the area is suitable for its post- <br /> mining use. <br /> All gold processing is accomplished using various forms of density separation and no chemical <br /> processing treatments are used on-site. Two sets of gold processing equipment will operate next <br /> to active pit areas and are composed of a trommel, grizzly, and sluice system. The processing <br /> building, located near the center of the permit area, houses a spiral and hydrocyclone used to <br /> further process for gold. Water used in on-site sluices and within the processing building is <br /> discharged into settling ponds 1-4 in sequential order. <br /> There are no crushers in the plant. Aggregate material from any steps may be separated and sold <br /> as an aggregate byproduct. Secondary commodity gravel will be crushed, screened, and washed <br /> on-site. Portable asphalt and concrete plants may be located on-site. Any gravel material from <br /> the plant that is not sold by the gravel operator will be backfilled into reclaimed areas on the site. <br /> The deposit is not consistent in terms of depth. it varies between 20 and 60 feet. Operations to <br /> this point found that deposit thicknesses averages roughly 30 feet deep. 30 foot average depth is <br /> used for the purpose of estimating material handling needs. Material mined from a gold pit will <br /> typically be replaced into that pit or a previously mined out area, since the majority of the <br /> volume and mass is not sellable. Additionally,uncompacted material swell creates an excess <br /> volume. Thus, it can be assumed there will be sufficient material generated during mining to <br /> reclaim the site. <br /> Only water is used in processing the gold and gravel. Most gold-bearing gravel is expected to be <br /> located below the water table; therefore, a pump will be located below the working area in each <br /> Alma Placer Mine <br /> December 2017 D-3 <br />